Quoting the overclockers article:
"What I found is that temps cycled over a 15 C range until they settled into a 5 C range, after about 5 minutes. The "Working" led settled into a pattern of 5-6 seconds ON, 8-9 seconds OFF."
That sounds fairly bad to me.
I can't say for certain, but I doubt there's anything remotely approaching the sophistication of a microcontroller running a PI routine in these things. My guess is some comparators and a bit of discrete logic.
Still, the parts cost to do this as a 'one-up' is going to be fairly high for a lot of people.
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